that explains it

Most of the articles produced by Yahoo! are poorly-researched, somewhat illogical, and riddled with grammatical errors.

However, the site has just redeemed itself with a rather enlightening article on popular diets... the only thing worth reading here is the last sentence under the "What's missing?" portion of the Paleo Diet:

The Paleo Diet is also low in carbohydrates-and there's research that shows limiting or eliminating carbs impacts your memory and your mood.

So that's why I remember everything! All hail the mighty potato and the royal court of pasta, rice, bread, and corn!